JPH07255296A - Pruning machine - Google Patents

Abstract

PURPOSE:To provide a pruning machine capable of not largely moving the position of the center of gravity as the whole pruning machine even in change of a distance between a motor side and the teeth of a saw and carrying out pruning operation always in a stable state thereby. CONSTITUTION:A motion changing device 12 for converting rotary motion to reciprocating motion is arranged at a motor 11 part of a base part of an operating lever 21, motion transmitting members 31 and 41 for transmitting the reciprocating motion to the teeth 71 of a saw is installed between the motion changing device 12 and the teeth 71 of a saw, length of the motion transmitting members 31 and 41 as the whole can be freely changed and the positions of the motion transmitting members are fixed by a length fixing fitment 51.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pruning machine, and more particularly to a pruning machine for cutting a branch of a standing tree by reciprocating a saw blade attached to the tip of an operating rod of the machine body in the longitudinal direction.

[0002]

2. Description of the Related Art Conventionally, in a pruning machine for cutting or trimming branches at a high place such as street trees and garden trees, a small air-cooled two-cycle gasoline engine installed at the base end side of an operating rod is used. The rotation output from the power source is transmitted to a reciprocating saw blade provided on the tip side of the operating rod, and the saw blade is applied to the branch to cut the branch.

In the conventional pruning machine, a motion converting device for converting the rotational output of the prime mover into a reciprocating motion is provided at the end of the operating rod on the saw blade side, and between the prime mover side and the motion converting device. Are connected by a rotary power transmission shaft. And
The power transmission shaft is covered with an operating rod fixed to the motor side. When the length of the operating rod is a fixed length, the range (particularly the height) in which the pruning can be smoothly performed is limited. Therefore, the telescopic operating rod as shown in FIG. 11 should be used for the pruning machine. It has been proposed (see Japanese Utility Model Laid-Open No. 63-134625, etc.).

In FIG. 11, this telescopic operating rod has a hollow main rod portion 101 and a movable rod portion 102 which is telescopically fitted into the main rod portion 101 and is movable in the axial direction, and a tightening sleeve 103. The movable rod portion 102 can be movably fixed to the main rod portion 101 by tightening or loosening. Main rod part 10
In the movable rod portion 102 and the movable rod portion 102, there is provided a rotary drive shaft 104 which is generally expandable and contractable by spline fitting or the like and extends concentrically in the longitudinal direction.
Is rotatably supported by the machine body 106 via a bearing 107, and is rotationally driven by a driving force from a prime mover (not shown) provided in the machine body 106. A saw blade is connected to the other end of the rotary drive shaft 104 via a motion conversion device (not shown) that converts rotational motion into reciprocating motion.

In the conventional pruning machine having such a configuration, the tightening sleeve 103 is loosened to move the movable rod portion 102.
By changing the length of the operating rod as a whole, the position of the saw blade with respect to the position of the prime mover can be adjusted, even if the branch is at a high position without preparing a stepladder etc. It can be cut and the operating rod can be shortened for compactness when moving.

[0006]

However, the motion converting device for converting a rotary motion into a reciprocating motion is large and heavy, and a pruning machine having such a motion converting device at the end of the operating rod on the saw blade side. If you operate in a place where branches are densely packed, the tip of the operating rod interferes with the branches and trunk, making work difficult. In addition, if the length of the operating rod is increased, the center of gravity of the pruning machine may move toward the saw blade side and move farther than the one hand holding the operating rod. There is a disadvantage that it becomes unstable.

The present invention has been made in view of the disadvantages of such a conventional pruning machine, and an object thereof is to make it possible to easily adjust the distance between the prime mover side and the saw blade. While this allows pruning work in high places to be performed smoothly, its adjustment prevents the center of gravity of the entire pruning machine from moving significantly, ensuring pruning work is always stable and safe. It is to provide a pruning machine that can be implemented. Still another object of the present invention is to simplify the configuration near the end where the saw blade is located,
An object of the present invention is to provide a pruning machine capable of smoothly performing pruning work even if the branches are densely located without the tip of the operating rod interfering with the branches or the trunk.

[0008]

In order to achieve the above object, a pruning machine according to the present invention is basically a motion conversion device for converting a rotary motion into a reciprocating motion in a prime mover portion on a base end side of an operating rod. A device is arranged, and a motion transmitting member for transmitting the reciprocating motion to the saw blade is arranged between the motion converting device and the saw blade arranged on the tip side of the operating rod, and the motion transmitting member as a whole has a long length. It is characterized by having means for changing the height.

[0009]

[Operation] In the pruning machine according to the present invention, since the motion converting device for converting the rotational motion into the reciprocating motion is arranged on the side of the prime mover, the center of gravity position of the pruning machine as a whole is close to the prime mover. Therefore, the operator can easily operate the saw blade located at the tip of the operating rod during the pruning work, and the workability is improved. When pruning a branch at a high position, it is possible to extend the length of the motion transmitting member that connects the motion conversion device and the saw blade to separate the position of the saw blade from the position of the prime mover. Even a branch can be easily cut. Even in that case, in the pruning machine according to the present invention, the weight in the vicinity of the saw blade is small compared to the weight around the prime mover, and the position of the saw blade may be set apart from the prime mover. There is almost no movement of the center of gravity of the pruning machine as a whole, and the center of gravity can always be positioned on the side of the hand holding the operating rod, which improves the operability.

Further, the construction of the saw blade mounting portion can be simplified, and even at a place where branches are densely arranged, the tip end side of the operating rod does not interfere with the branches and the trunk, and the pruning work can be carried out smoothly. It can be done.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view of a pruning machine 10 according to an embodiment of the present invention, and FIG. 2 is a side view. The pruning machine 10 is of a type in which a motion conversion device that converts the rotational motion of the prime mover into a reciprocating motion is arranged on the side of the prime mover. That is, in the upper part of a prime mover 11 such as an air-cooled two-cycle gasoline engine that operates as a drive source, there is a motion conversion device 12, such as a cross-slider type motion conversion device, that converts rotational motion through an appropriate speed reducer (not shown) into reciprocating motion. The support rod T1 that is provided and extends rearward of the cross slider T of the motion converting device 12 is slidably supported by the machine frame F on the side of the right hand grip 17 provided at the rear portion of the prime mover 11. As will be described later in detail, the support rod T2 extending forward is a base end of a mover-side movable rod 31 that constitutes a reciprocating motion transmission member that is reciprocally arranged in a fixed operation rod 21 fixed to the machine frame F. Connected to the section (see also FIG. 3). In the figure, 13
Is a throttle lever, and 14 is the fixed operating rod 21.
It is a left-handed grip attached to the outer periphery of.

In the pruning machine 10 of this embodiment, the motion transmitting member for transmitting the reciprocating motion converted by the motion converting device 12 to the saw blade 71 has the following structure. That is, as shown in detail in FIGS. 4 and 5, the fixed operation rod 21 fixed to the machine frame F has the first slide bearing member 2 on the inner surface side thereof.
2 is fixed. The first sliding bearing member 22 is a pair of opposing sliding bearing members 22a, 22 having a U-shaped cross section.
b, and is fixed to the inner wall surface positions on both sides of the fixed operation rod 21 by rivets 23.

The fixed operating rod 21 is inserted with the hollow movable shaft 31 on the side of the prime mover extending in the same axial direction, and the end portion thereof on the side of the motion converting device 12 is the one of the cross slider T. Spacer 3 on the support rod T2 extending forward
2 and 32 are integrally connected by a pin 33 (see FIGS. 3 and 6), and the other end is the fixed operation rod 2
It extends beyond the tip of No. 1 and further forward.

As shown in detail in FIGS. 4 and 5, the first slide bearing member 2 which is on the upper and lower outer surfaces of the prime mover-side movable rod 31 and which is fixed to the fixed operating rod 21 during assembly.
A second sliding bearing member 34 is fixed to the portion facing 2 in FIG. The second sliding bearing member 34 is the first sliding bearing member 34.
Similar to the sliding bearing member 22, the sliding bearing member 22 is composed of a pair of sliding bearing members 34a and 34b having U-shaped cross-sections and facing each other, and is fixed to upper and lower outer surface positions of the prime mover-side movable rod 31 by rivets 35. As shown in detail in FIG. 5, the shapes and sizes of the first sliding bearing 22 and the second sliding bearing 34 are such that when the prime mover-side movable rod 31 is inserted into the fixed operating rod 21, the first sliding bearing The shape and size are such that the outer surface side of the second slide bearing 34 is closely fitted to the inner surface side of 22 and can be slidable with respect to each other.

As described above, the first sliding bearing member 22 fixed to the inner surface of the fixed operation rod 21 and the second sliding bearing member 34 fixed to the outer surface of the prime mover-side movable rod 31 are 90 degrees to each other. Since they are fixed to the fixed operation rod 21 and the prime mover-side movable rod 31 in different positions, as shown in FIG. 5, the fixing rivets 23,
The head of 35 passes through the space between the pair of sliding bearing members, so that the prime mover-side movable rod 31 can smoothly reciprocate in the fixed operation rod 21.

As shown in FIGS. 3 and 4, a hollow telescopic rod 41, which is integrated with the movable rod 31 and constitutes a reciprocating motion transmitting member, is inserted in the movable rod 31 in a nesting manner. As will be described later, the telescopic rod 41 is fixed to the prime mover-side movable rod 31 at an arbitrary position by a length fixing fitting 51. A fixing bracket 6 is attached to the tip of the expandable rod 41.
The saw blade 71 is fixed by 1 and the mounting bolt 62.

7 to 9 show the details of the length fixing fitting 51. As shown in FIG. As shown in FIG. 8, the length fixing metal fitting 51 has a fitting hole 52a that fits into the tip of the movable rod 31.
And a second portion 53 which is continuous from the first portion 52 to the front and which has a through hole 53a through which the expansion rod 41 is inserted, and below the second portion 53. The part is formed with a slit 54 that is continuous in the axial direction. The first portion 52 of the slot 54
A screw hole 56 is formed in the main body portion corresponding to
Screw holes 57 are formed in the main body portion corresponding to the portion 53, and fastening bolts 58 and 59 are screwed into the respective screw holes 57. These tightening bolts 5
By loosening 8, 59, the fitting hole 52a and the through hole 53a respectively formed therein are expanded in diameter, and the tip of the movable rod 31 can be freely inserted into the fitting hole 52a. The expansion rod 41 can be freely inserted into the hole 53a. After the insertion, by tightening the one tightening bolt 58, the length fixing fitting 51 is fixed to the tip of the movable rod 31, and by tightening the other tightening bolt 59, the expansion rod 41 is inserted.
In the through hole 53a formed in the second portion,
It is fixed at any position on the axial direction.

The pruning machine 10 according to this embodiment is used as follows. First, the length fixing metal fitting 51 is attached to the tip of the movable rod 31, and then the one fastening bolt 58 is tightened to fix the length fixing metal fitting 51 to the tip of the movable rod 31. Next, the expandable rod 41 having the saw blade 71 attached to the tip thereof is inserted into the through hole 53a formed in the second portion 53 of the length fixing metal fitting 51, and the saw blade 71 and the fixing operation rod 21 are inserted. When the distance from the tip of the other end reaches a desired distance, the other tightening bolt 5
Tighten 9. Thereby, the expandable rod 41 is positioned and the length of the reciprocating motion transmitting member as a whole is fixed.

In this state, the prime mover 11 is started. As described above, the rotational force of the prime mover 11 is converted into a reciprocating motion by the motion conversion device 12, and is transmitted to the movable rod 31 via the support rod T2 of the cross slider T. The movable rod 31 is guided by the slide bearing members 22 and 34 and reciprocates in the fixed operation rod 21 fixed to the machine frame F. As described above, the telescopic rod 41 is fixed to the tip of the movable rod 31 by the length fixing metal fitting 51, and the saw blade 71 is fixed to the tip thereof. Therefore, the rotational driving force of the prime mover 11 becomes a reciprocating motion and is transmitted to the saw blade 71, and a required pruning operation is performed.

There are cases where the working environment changes and it is desired to change the position of the saw blade 71 to a higher position or a lower position. In that case, the second member of the length fixing fitting 51
Loosen the tightening bolt 59 provided on the portion 53 of the.
As a result, the diameter of the through hole 53a is expanded, and the fixed state of the expansion rod 41 and the length fixing fitting 51 is released, and the expansion rod 4
1 can move freely in the movable rod 31 in the axial direction.
After moving the telescopic rod 41 by a desired distance, tighten the tightening bolts 59, and then re-tighten the telescopic rod 41 with the metal fitting 51 for fixing the length.
The position adjusting operation of the saw blade 71 is completed by fixing the saw blade 71 to the position. In addition, at the time of transportation, the expansion rod 41 can be pushed into the movable rod 31 as much as possible to make the pruning machine as a whole compact.

As described above, the pruning machine having the motion converting device 12 on the side of the prime mover 11 has the saw blade 71.
It is possible to arbitrarily change the axial distance with respect to the proximal side of the. Further, the configuration in the vicinity of the end where the saw blade 71 is located is only the fixing metal fitting 61 for fixing the saw blade, and the weight in the vicinity of the saw blade 71 is slight compared with the weight around the prime mover 11. Even if the blade 71 is located away from the prime mover 11 side, there is almost no displacement of the center of gravity of the pruning machine, and the right hand side grip 1 that always operates the prime mover 11
7 and the left-hand side grip 14 holding the fixed operation rod 21 can be positioned, and operability is improved.

Further, since the structure on the side where the saw blade 71 is located is simplified, it is possible to perform the pruning work smoothly without interfering with the branches or the trunk even in a place where the branches are densely packed. Becomes Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various design changes can be made without departing from the present invention described in the claims. Is possible.

For example, in the illustrated example, the expandable rod 41 is attached to the movable rod 3.
Although the length fixing metal fitting 51 having the two tightening bolts 58 and 59 has been shown as a means for positioning with respect to 1, the expansion rod 41 tightening fixing metal fitting is integrally formed at the tip of the movable rod 31, and one The position of the telescopic rod 41 may be adjusted only with the tightening bolts. Also. Fixed operating rod 21
As the structure of the sliding bearings of the movable rod 31 and the movable rod 31, the sliding bearing member is attached to each of them, but the sliding bearing member is attached to only one of the sliding bearing members by fitting or heat fusion, and the sliding bearing member only slides. It is also possible to provide motion guidance. Further, the movable rod 31 and the telescopic rod 41 as the motion transmitting members for transmitting the reciprocating motion arranged between the motion converting device and the saw blade to the saw blade are shown as hollow rectangular rods in the drawings, It is possible to use a circular rod, an elliptic rod, or any other shape, provided that the blade 70 does not rotate about the axis. Also,
Instead of the saw blade, a hook having an appropriate shape can be attached to perform dead leaf dropping, fruit dropping, and the like.

[0024]

As is apparent from the above description, in the pruning machine according to the present invention, the motion converting device for converting the rotary motion of the prime mover into the reciprocating motion is arranged in the prime mover portion on the base end side of the operating rod. Since the distance between the saw blades can be easily adjusted, it is possible to easily perform pruning work at high places without using a stepladder, etc., and adjust the working height to position the center of gravity of the pruning machine as a whole. The pruning work can always be carried out in a stable state without the large movement of the plow. Further, since the structure in the vicinity of the end on the saw blade side can be simplified, it is possible to perform the pruning work smoothly even if the branches are densely packed without the tip of the operating rod interfering with the branch or the trunk.

[Brief description of drawings]

FIG. 1 is a plan view of a pruning machine according to an embodiment of the present invention.

FIG. 2 is a side view of a pruning machine according to an embodiment of the present invention.

FIG. 3 is an enlarged sectional view of a main part of a pruning machine according to an embodiment of the present invention.

FIG. 4 is an enlarged perspective view in which a part of the sliding bearing portion is cut away for explaining the sliding bearing portion.

5 is an enlarged sectional view taken along line VV of FIG.

6 is an enlarged sectional view taken along line VI-VI of FIG.

FIG. 7 is a perspective view showing a length-fixing metal part of a motion-transmitting member configured in a telescopic manner.

FIG. 8 is a view showing a cross section in the vicinity of a length fixing metal fitting attachment position.

9 is a sectional view taken along line IX-IX in FIG.

10 is a sectional view taken along line XX of FIG.

FIG. 11 is a view for explaining a telescopic mechanism of an operating rod used in a conventional pruning machine.

[Explanation of symbols]

 10 ... Pruner 11 ... Motor 12 ... Motion conversion device 14 ... Left hand grip 17 ... Right hand grip 21 ... Fixed operation rod 31 ... Motion transmission member (movable rod) 41 ... Motion transmission member (expandable rod) 51 ... For fixing length Metal fitting 71 ... Saw blade T ... Cross slider

Claims (1)

[Claims] 1. A prime mover (1) on the proximal end side of the operating rod (21).
A motion converting device (12) for converting a rotary motion into a reciprocating motion is arranged in the section 1), and between the motion converting device (12) and the saw blade (71) arranged on the tip side of the operating rod (21). A motion transmitting member (31, 41) for transmitting the reciprocating motion to the saw blade (71) is arranged in the
A pruning machine comprising means (51) capable of changing the overall length of 1).